Technician instructed me to purchase Sonos Amp and a separate 8-channel speaker selector for the 8 built-in speakers in my home. I also have 2 Sonos Ones in other rooms. When a different technician came to set up everything, he did it totally different from what the first guy told us, and even when questioned, he just said he didn’t know why the first guy told me that, and basically had no answers. He grouped all of my built-in speakers during the Sonos Amp setup process, and I cannot figure out how to change them. Can that even be undone without starting all over? They are labeled as 4 separate pairs on the channel selector, but not in the App or the PC Controller. I am hoping there is a simple way to do that on my own without having to schedule another appointment and pay again. Thank you.